Ultrasonic distance estimator



FIG. 1 is a top plan view of an ultrasonic distance estimator, showing my new design;

FIG. 2 is a bottom plan view;

FIG. 3 is a right side elevational view, the left side elevational view being identical;

FIG. 4 is a front elevational view;

FIG. 5 is a rear elevational view thereof. 

The ornamental design for an ultrasonic distance estimator, as shown and described. 